TY - CONF T1 - Local Closed World Semantics: Grounded Circumscription for OWL T2 - The Semantic Web - ISWC 2011 - 10th International Semantic Web Conference, Bonn, Germany, October 23-27, 2011, Proceedings, Part I Y1 - 2011 A1 - Kunal Sengupta A1 - Adila Krisnadhi A1 - Pascal Hitzler ED - Lora Aroyo ED - Chris Welty ED - Harith Alani ED - Jamie Taylor ED - Abraham Bernstein ED - Lalana Kagal ED - Natasha F. Noy ED - Eva Blomqvist AB - We present a new approach to adding closed world reasoning to the Web Ontology Language OWL. It transcends previous work on circumscriptive description logics which had the drawback of yielding an undecidable logic unless severe restrictions were imposed. In particular, it was not possible, in general, to apply local closure to roles. In this paper, we provide a new approach, called grounded circumscription, which is applicable to SROIQ and other description logics around OWL without these restrictions. We show that the resulting language is decidable, and we derive an upper complexity bound. We also provide a decision procedure in the form of a tableaux algorithm. JF - The Semantic Web - ISWC 2011 - 10th International Semantic Web Conference, Bonn, Germany, October 23-27, 2011, Proceedings, Part I PB - Springer VL - 7031 ER -